Struct core::num::NonZeroI32
1.34.0 · source · #[repr(transparent)]pub struct NonZeroI32(_);
Expand description
已知不等于零的整数。
这样可以进行一些内存布局优化。
For example, Option<NonZeroI32>
is the same size as i32
:
use std::mem::size_of;
assert_eq!(size_of::<Option<core::num::NonZeroI32>>(), size_of::<i32>());
RunLayout
NonZeroI32
is guaranteed to have the same layout and bit validity as i32
除了 0
不是有效实例。
Option<NonZeroI32>
is guaranteed to be compatible with i32
,
包括在 FFI 中。
Implementations§
source§impl NonZeroI32
impl NonZeroI32
source§impl NonZeroI32
impl NonZeroI32
1.53.0 (const: 1.53.0) · sourcepub const fn leading_zeros(self) -> u32
pub const fn leading_zeros(self) -> u32
1.53.0 (const: 1.53.0) · sourcepub const fn trailing_zeros(self) -> u32
pub const fn trailing_zeros(self) -> u32
source§impl NonZeroI32
impl NonZeroI32
1.64.0 (const: 1.64.0) · sourcepub const fn abs(self) -> NonZeroI32
pub const fn abs(self) -> NonZeroI32
1.64.0 (const: 1.64.0) · sourcepub const fn checked_abs(self) -> Option<NonZeroI32>
pub const fn checked_abs(self) -> Option<NonZeroI32>
1.64.0 (const: 1.64.0) · sourcepub const fn overflowing_abs(self) -> (NonZeroI32, bool)
pub const fn overflowing_abs(self) -> (NonZeroI32, bool)
1.64.0 (const: 1.64.0) · sourcepub const fn saturating_abs(self) -> NonZeroI32
pub const fn saturating_abs(self) -> NonZeroI32
饱和绝对值,请参见
i32::saturating_abs
.
Example
let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;
let min = NonZeroI32::new(i32::MIN)?;
let min_plus = NonZeroI32::new(i32::MIN + 1)?;
let max = NonZeroI32::new(i32::MAX)?;
assert_eq!(pos, pos.saturating_abs());
assert_eq!(pos, neg.saturating_abs());
assert_eq!(max, min.saturating_abs());
assert_eq!(max, min_plus.saturating_abs());
Run1.64.0 (const: 1.64.0) · sourcepub const fn wrapping_abs(self) -> NonZeroI32
pub const fn wrapping_abs(self) -> NonZeroI32
包装绝对值,请参见
i32::wrapping_abs
.
Example
let pos = NonZeroI32::new(1)?;
let neg = NonZeroI32::new(-1)?;
let min = NonZeroI32::new(i32::MIN)?;
assert_eq!(pos, pos.wrapping_abs());
assert_eq!(pos, neg.wrapping_abs());
assert_eq!(min, min.wrapping_abs());
assert_eq!(max, (-max).wrapping_abs());
Run1.64.0 (const: 1.64.0) · sourcepub const fn unsigned_abs(self) -> NonZeroU32
pub const fn unsigned_abs(self) -> NonZeroU32
在没有任何包装或 panicking 的情况下计算 self 的绝对值。
Example
let u_pos = NonZeroU32::new(1)?;
let i_pos = NonZeroI32::new(1)?;
let i_neg = NonZeroI32::new(-1)?;
let i_min = NonZeroI32::new(i32::MIN)?;
let u_max = NonZeroU32::new(u32::MAX / 2 + 1)?;
assert_eq!(u_pos, i_pos.unsigned_abs());
assert_eq!(u_pos, i_neg.unsigned_abs());
assert_eq!(u_max, i_min.unsigned_abs());
Run1.71.0 (const: 1.71.0) · sourcepub const fn is_positive(self) -> bool
pub const fn is_positive(self) -> bool
1.71.0 (const: 1.71.0) · sourcepub const fn is_negative(self) -> bool
pub const fn is_negative(self) -> bool
1.71.0 (const: 1.71.0) · sourcepub const fn checked_neg(self) -> Option<NonZeroI32>
pub const fn checked_neg(self) -> Option<NonZeroI32>
1.71.0 (const: 1.71.0) · sourcepub const fn overflowing_neg(self) -> (NonZeroI32, bool)
pub const fn overflowing_neg(self) -> (NonZeroI32, bool)
否定 self,如果等于最小值,则溢出。
See i32::overflowing_neg
有关溢出行为的文档。
Example
let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;
assert_eq!(pos_five.overflowing_neg(), (neg_five, false));
assert_eq!(min.overflowing_neg(), (min, true));
Run1.71.0 (const: 1.71.0) · sourcepub const fn saturating_neg(self) -> NonZeroI32
pub const fn saturating_neg(self) -> NonZeroI32
饱和否定。计算 -self
,如果 self == i32::MIN
而不是溢出则返回 MAX
。
Example
let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;
let min_plus_one = NonZeroI32::new(i32::MIN + 1)?;
let max = NonZeroI32::new(i32::MAX)?;
assert_eq!(pos_five.saturating_neg(), neg_five);
assert_eq!(min.saturating_neg(), max);
assert_eq!(max.saturating_neg(), min_plus_one);
Run1.71.0 (const: 1.71.0) · sourcepub const fn wrapping_neg(self) -> NonZeroI32
pub const fn wrapping_neg(self) -> NonZeroI32
包装 (modular) 取反。
计算 -self
,在类型的边界处回绕。
See i32::wrapping_neg
有关溢出行为的文档。
Example
let pos_five = NonZeroI32::new(5)?;
let neg_five = NonZeroI32::new(-5)?;
let min = NonZeroI32::new(i32::MIN)?;
assert_eq!(pos_five.wrapping_neg(), neg_five);
assert_eq!(min.wrapping_neg(), min);
Runsource§impl NonZeroI32
impl NonZeroI32
1.64.0 (const: 1.64.0) · sourcepub const fn checked_mul(self, other: NonZeroI32) -> Option<NonZeroI32>
pub const fn checked_mul(self, other: NonZeroI32) -> Option<NonZeroI32>
1.64.0 (const: 1.64.0) · sourcepub const fn saturating_mul(self, other: NonZeroI32) -> NonZeroI32
pub const fn saturating_mul(self, other: NonZeroI32) -> NonZeroI32
sourcepub const unsafe fn unchecked_mul(self, other: NonZeroI32) -> NonZeroI32
🔬This is a nightly-only experimental API. (nonzero_ops
#84186)
pub const unsafe fn unchecked_mul(self, other: NonZeroI32) -> NonZeroI32
nonzero_ops
#84186)1.64.0 (const: 1.64.0) · sourcepub const fn checked_pow(self, other: u32) -> Option<NonZeroI32>
pub const fn checked_pow(self, other: u32) -> Option<NonZeroI32>
1.64.0 (const: 1.64.0) · sourcepub const fn saturating_pow(self, other: u32) -> NonZeroI32
pub const fn saturating_pow(self, other: u32) -> NonZeroI32
source§impl NonZeroI32
impl NonZeroI32
Trait Implementations§
source§impl Binary for NonZeroI32
impl Binary for NonZeroI32
1.45.0 · source§impl BitOr<NonZeroI32> for NonZeroI32
impl BitOr<NonZeroI32> for NonZeroI32
1.45.0 · source§impl BitOr<NonZeroI32> for i32
impl BitOr<NonZeroI32> for i32
§type Output = NonZeroI32
type Output = NonZeroI32
|
运算符后的结果类型。1.45.0 · source§impl BitOr<i32> for NonZeroI32
impl BitOr<i32> for NonZeroI32
1.45.0 · source§impl BitOrAssign<NonZeroI32> for NonZeroI32
impl BitOrAssign<NonZeroI32> for NonZeroI32
source§fn bitor_assign(&mut self, rhs: Self)
fn bitor_assign(&mut self, rhs: Self)
|=
操作。 Read more1.45.0 · source§impl BitOrAssign<i32> for NonZeroI32
impl BitOrAssign<i32> for NonZeroI32
source§fn bitor_assign(&mut self, rhs: i32)
fn bitor_assign(&mut self, rhs: i32)
|=
操作。 Read moresource§impl Clone for NonZeroI32
impl Clone for NonZeroI32
source§fn clone(&self) -> NonZeroI32
fn clone(&self) -> NonZeroI32
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
执行复制分配。 Read moresource§impl Debug for NonZeroI32
impl Debug for NonZeroI32
source§impl Display for NonZeroI32
impl Display for NonZeroI32
1.41.0 · source§impl From<NonZeroI16> for NonZeroI32
impl From<NonZeroI16> for NonZeroI32
source§fn from(small: NonZeroI16) -> Self
fn from(small: NonZeroI16) -> Self
Converts NonZeroI16
to NonZeroI32
losslessly.
1.41.0 · source§impl From<NonZeroI32> for NonZeroI128
impl From<NonZeroI32> for NonZeroI128
source§fn from(small: NonZeroI32) -> Self
fn from(small: NonZeroI32) -> Self
Converts NonZeroI32
to NonZeroI128
losslessly.
1.41.0 · source§impl From<NonZeroI32> for NonZeroI64
impl From<NonZeroI32> for NonZeroI64
source§fn from(small: NonZeroI32) -> Self
fn from(small: NonZeroI32) -> Self
Converts NonZeroI32
to NonZeroI64
losslessly.
1.31.0 · source§impl From<NonZeroI32> for i32
impl From<NonZeroI32> for i32
source§fn from(nonzero: NonZeroI32) -> Self
fn from(nonzero: NonZeroI32) -> Self
Converts a NonZeroI32
into an i32
1.41.0 · source§impl From<NonZeroI8> for NonZeroI32
impl From<NonZeroI8> for NonZeroI32
1.41.0 · source§impl From<NonZeroU16> for NonZeroI32
impl From<NonZeroU16> for NonZeroI32
source§fn from(small: NonZeroU16) -> Self
fn from(small: NonZeroU16) -> Self
Converts NonZeroU16
to NonZeroI32
losslessly.
1.41.0 · source§impl From<NonZeroU8> for NonZeroI32
impl From<NonZeroU8> for NonZeroI32
1.35.0 · source§impl FromStr for NonZeroI32
impl FromStr for NonZeroI32
source§impl Hash for NonZeroI32
impl Hash for NonZeroI32
source§impl LowerHex for NonZeroI32
impl LowerHex for NonZeroI32
1.71.0 · source§impl Neg for &NonZeroI32
impl Neg for &NonZeroI32
1.71.0 · source§impl Neg for NonZeroI32
impl Neg for NonZeroI32
§type Output = NonZeroI32
type Output = NonZeroI32
-
运算符后的结果类型。source§fn neg(self) -> NonZeroI32
fn neg(self) -> NonZeroI32
-
运算。 Read moresource§impl Octal for NonZeroI32
impl Octal for NonZeroI32
source§impl Ord for NonZeroI32
impl Ord for NonZeroI32
source§impl PartialEq<NonZeroI32> for NonZeroI32
impl PartialEq<NonZeroI32> for NonZeroI32
source§impl PartialOrd<NonZeroI32> for NonZeroI32
impl PartialOrd<NonZeroI32> for NonZeroI32
1.49.0 · source§impl TryFrom<NonZeroI128> for NonZeroI32
impl TryFrom<NonZeroI128> for NonZeroI32
source§fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI128) -> Result<Self, Self::Error>
Attempts to convert NonZeroI128
to NonZeroI32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroI16
impl TryFrom<NonZeroI32> for NonZeroI16
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroI16
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroI8
impl TryFrom<NonZeroI32> for NonZeroI8
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroI8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroIsize
impl TryFrom<NonZeroI32> for NonZeroIsize
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroIsize
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroU128
impl TryFrom<NonZeroI32> for NonZeroU128
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroU128
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroU16
impl TryFrom<NonZeroI32> for NonZeroU16
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroU16
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroU32
impl TryFrom<NonZeroI32> for NonZeroU32
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroU32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroU64
impl TryFrom<NonZeroI32> for NonZeroU64
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroU64
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroU8
impl TryFrom<NonZeroI32> for NonZeroU8
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroU8
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI32> for NonZeroUsize
impl TryFrom<NonZeroI32> for NonZeroUsize
source§fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI32) -> Result<Self, Self::Error>
Attempts to convert NonZeroI32
to NonZeroUsize
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroI64> for NonZeroI32
impl TryFrom<NonZeroI64> for NonZeroI32
source§fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroI64) -> Result<Self, Self::Error>
Attempts to convert NonZeroI64
to NonZeroI32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroIsize> for NonZeroI32
impl TryFrom<NonZeroIsize> for NonZeroI32
source§fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroIsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroIsize
to NonZeroI32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU128> for NonZeroI32
impl TryFrom<NonZeroU128> for NonZeroI32
source§fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU128) -> Result<Self, Self::Error>
Attempts to convert NonZeroU128
to NonZeroI32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU32> for NonZeroI32
impl TryFrom<NonZeroU32> for NonZeroI32
source§fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU32) -> Result<Self, Self::Error>
Attempts to convert NonZeroU32
to NonZeroI32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroU64> for NonZeroI32
impl TryFrom<NonZeroU64> for NonZeroI32
source§fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
fn try_from(value: NonZeroU64) -> Result<Self, Self::Error>
Attempts to convert NonZeroU64
to NonZeroI32
.
§type Error = TryFromIntError
type Error = TryFromIntError
1.49.0 · source§impl TryFrom<NonZeroUsize> for NonZeroI32
impl TryFrom<NonZeroUsize> for NonZeroI32
source§fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
fn try_from(value: NonZeroUsize) -> Result<Self, Self::Error>
Attempts to convert NonZeroUsize
to NonZeroI32
.